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4-chloro-2-methylthieno[2,3-d]pyrimidine; CAS No.: 56843-79-9; As a leading chemicals distributor, ChemShuttle provides 4-chloro-2-methylthieno[2,3-d]pyrimidine for targeted covalent inhibitor development. The methyl group enhances target residence time through hydrophobic interactions. With molecular weight 185.65 and measured IC50 <100nM in kinase assays, it serves as valuable scaffold. Our production process controls regioisomeric impurities to <0.5%. Technical support includes cysteine reactivity profiling.